The invention discloses a subway underground operation space safety monitoring and early warning system for timely finding safety problems and hidden dangers in subway operation. The system comprisesa sensor subsystem, a data transmission subsystem, a server and a user side, wherein a database subsystem, a data processing subsystem and an application subsystem are arranged in the server; the sensor subsystem writes the acquired data to the database subsystem through the data transmission subsystem; ant administrator uses the user side to be connected with the server through the data transmission subsystem and then selects applications which need to be used; the application subsystem selects corresponding environment information and preset judgement information in the database subsystem according to the applications selected by the administrator and transmits the information to the data processing subsystem, the data processing subsystem performs data analysis and processing, the analyzed data result is returned to a corresponding application unit, and the corresponding application unit carries out visual display on the analyzed data result through a visual display management unit.